10. What questions should be asked about a secondary source?

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A secondary source is a source from a second hand account about the event involving a person, place, or incident. Secondary sources are most likely reliable if you gather information from other secondary sources to check that they all say the same thing. Typically secondary sources are formed from information passed on from the primary source, which is like a giant game of telephone because the information can easily be mixed up and changed. The questions that should be asked about secondary sources is their reliability. If you have the same information with 2 secondary sources, than the secondary source you are using is reliable.

http://www.library.illinois.edu/ugl/howdoi/secondarysources.html